Which biological scenario(s) best describes a rigid phenotype for gene expression? I. Each person has a specific blood type.
II. Red blood cell counts differ in higher altitudes.
III. One identical twin is taller than the other.

1) I only

2) II only

3) II and III only

4) I, II, and III

Answer is 3 because it seems more logical

Explanation:

seems more logical

1) I only

Explanation:

A person's blood type is more specific whereas one's red blood cell count and height varies.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

can i get the brainliest pls

explanation: